Created attachment 501784[details]
bios with "IBM ENSW" mptables oem
Looks like this guest does not really support 16 cpus, only 15. Only some machines are white listed to run with more then 15 cpu. Can you try to run with the bios.bin I attached. I change it to pretend we are one of such machines (although guest will try to use some other HW we do not emulate with this bios, but it should detect that HW is not present and continue).

OK. So the panic in comment #0 is indeed the guest bug (actually not a bug, but limitation). Why it finds only 13 cpus with modified BIOS is not important since we do not implement this type of machine anyway. Closing as not a bug.

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